TY - JOUR ID - 3327 TI - Impact of surface dissolution on flotation kinetics and kinetics of collector adsorption on ilmenite ore JO - Amirkabir Journal of Civil Engineering JA - CEEJ LA - en SN - 2588-297X AU - Salmani Nuri, Omid AU - Irannajad, mehdi AU - Mehdilo, Akbar AD - Amirkabir University of Technology AD - AD - AUT Y1 - 2020 PY - 2020 VL - 52 IS - 6 SP - 1469 EP - 1484 KW - Surface dissolution KW - Kinetics KW - Flotation KW - Collector adsorption KW - Ilmenite DO - 10.22060/ceej.2019.15399.5909 N2 - In this study, the effect of surface dissolution by oxalic acid was investigated on the flotation kinetics and kinetics of collector adsorption for ilmenite in the presence of olivine-pyroxene, tremolite-clinochlore and quartz. Fitting of first-order kinetic model on the results of flotation before and after surface dissolution showed that flotation kinetic constant (K) and ultimate recovery (R∞) of ilmenite is increased after surface dissolution and they are decreased for gangue minerals. The results showed that the kinetic selectivity index of ilmenite in the presence of olivine-pyroxene, tremolite-clinochlore and quartz are increased from 1.28 to 1.98, 1.42 to 3.02, and 3.58, respectively, after surface dissolution indicating the positive effect of surface dissolution process. Investigating the kinetics of collector adsorption showed that the collector adsorption is conforming to second[1]order kinetic model. After surface dissolution, the kinetics of collector adsorption and initial rate of collector adsorption on ilmenite surface is increased from 3.85 to 8.44 g.mol-1 min-1 and it is decreased for olivine-pyroxene, tremolite-clinochlore and quartz from 6.33 to 5.03, 7.3 to 6.22 and 7.77 to 7.37 g.mol-1 min-1, respectively. These results are in good agreement with the results of collector adsorption via UV analysis which the collector adsorption on ilmenite surface is increased and it is decreased for gangue minerals after surface dissolution. The results of SEM showed that the surface of ilmenite becomes smoother and uniform and about the gangue minerals, some cavities are produced due to dissolution of surface cations. UR - https://ceej.aut.ac.ir/article_3327.html L1 - https://ceej.aut.ac.ir/article_3327_0d8da99e40d798b486b241729260fa5a.pdf ER -